linux-kernel - Re: [PATCH, RFC, tip/core/rcu] scalable classic RCU implementation

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Date:	Mon, 25 Aug 2008 08:16:45 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Josh Triplett <josht@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, cl@...ux-foundation.org,
	mingo@...e.hu, akpm@...ux-foundation.org, manfred@...orfullife.com,
	dipankar@...ibm.com, schamp@....com, niv@...ibm.com,
	dvhltc@...ibm.com, ego@...ibm.com, laijs@...fujitsu.com,
	rostedt@...dmis.org
Subject: Re: [PATCH, RFC, tip/core/rcu] scalable classic RCU implementation

On Mon, Aug 25, 2008 at 12:34:56PM +0200, Peter Zijlstra wrote:
> On Fri, 2008-08-22 at 16:29 -0700, Josh Triplett wrote:
> 
> > > @@ -26,8 +27,10 @@
> > >   * http://lse.sourceforge.net/locking/rclock_OLS.2001.05.01c.sc.pdf (OLS2001)
> > >   *
> > >   * For detailed explanation of Read-Copy Update mechanism see -
> > > - * 		Documentation/RCU
> > > - *
> > > + * 	Documentation/RCU
> > > + * 	http://lwn.net/Articles/262464/ (What is RCU, Fundamentally?)
> > > + * 	http://lwn.net/Articles/263130/ (What is RCU's Usage?)
> > > + * 	http://lwn.net/Articles/264090/ (What is RCU's API? + references)
> > >   */
> > 
> > Why put these references here rather than in Documentation/RCU?  It
> > seems easier to keep documentation up to date in one place.  If you
> > think these represent a good "getting started" set of documents, how
> > about a Documentation/RCU/ReadTheseFirst with links to them, or how
> > about linking to them from whatisRCU.txt?
> 
> I actually like in code comments and 'documentation' more than
> Documentation/ stuff. Mostly because Documentation/ is:
>  - far away from the code
>  - therefore, more easily bitrotted
>  - and easily forgotten

I know!!!

#ifdef JOSH_TRIPLETT
 * 	Documentation/RCU
 * 	http://lwn.net/Articles/262464/ (What is RCU, Fundamentally?)
 * 	http://lwn.net/Articles/263130/ (What is RCU's Usage?)
 * 	http://lwn.net/Articles/264090/ (What is RCU's API? + references)
#elif PETER_ZIJLSTRA
 * 	Documentation/RCU
#endif

(Sorry, couldn't resist!!!)

Seriously, I know where all the documentation is, as I wrote most of it.
These comments are for you guys.  So, any thoughts on how I should
resolve this?  My default is, as always, a coin flip.  ;-)

							Thanx, Paul
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